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Simplifying x + -15 + x + -21 = 90 Reorder the terms: -15 + -21 + x + x = 90 Combine like terms: -15 + -21 = -36 -36 + x + x = 90 Combine like terms: x + x = 2x -36 + 2x = 90 Solving -36 + 2x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '36' to each side of the equation. -36 + 36 + 2x = 90 + 36 Combine like terms: -36 + 36 = 0 0 + 2x = 90 + 36 2x = 90 + 36 Combine like terms: 90 + 36 = 126 2x = 126 Divide each side by '2'. x = 63 Simplifying x = 63
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